Why Veto Kestone Pipeline?

This very cold winter makes one appreciate the abundance of oil and natural gas to keep us warm. When I read that President Obama had vetoed the Keystone XL pipeline, I was looking for solid reasons for him to do so [Feb. 25, news, "In Veto Wars, Keystone Is 1st Victim"]. I found none. Two of the reasons that were given I don't think are legitimate.

1. Job creation is temporary. No kidding, every construction project is temporary, as once the project is done, the workers leave. That is like telling a builder that it is worthless for him to build an addition to your house as once it is completed you no longer need him.

2. The pipeline would add huge amounts of CO2 to the atmosphere. I am no scientist, but I can't understand how a pipeline that just carries oil would create CO2. The CO2 is created when it is burned for energy or heat. Again, another baseless excuse.

Obama ignored the benefit -- more energy supplied from a friendly neighboring country, not the Middle East. If he could not give a decent reason for the veto, one must ask why did he really veto the pipeline? Does he not want to foster more energy independence? It makes me wonder about his real motives and fosters a lack of trust and confidence in his decision-making.